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cardiac muscle
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∙ 10y ago
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A period after an initial stimulus when a neuron is not sensitive to another stimulus is the?
After the generation and propagation of an action potential along a neuron, the cell becomes depolarized to the point where there is no potential for further signaling until the cell re-polarizes through the action of ion pumps. This very brief period is called the refractory state.
Can cardiacmuscle be tetanize?
No. One of themost interesting feartures of cardiac muscle is that it has a long refractory period and so conduction cant be continuous and so tetanus is impossible.
During which period can a second action potential be initiated by a larger than normal stimulus?
This the relative refractory period.
During the absolute refractory period along an axon membrane of a neuron?
the neuron is unable to respond to a stimulus of any intensity
What is the relaxing phase of the cardiac cycle?
The resting phace of the cardiac cycle is known as the refractory period
When a muscle is unable to respond to stimuli temporarily which period is it in?
The refractory period is when a muscle is temporary unable to respond to stimuli refractory period
What period is a muscle is unable to respond to stimuli temporarily?
The refractory period is when a muscle is temporary unable to respond to stimuli refractory period
Does a Man or woman have longer refractory period?
No
Why impossible for myocardium to go into tetany?
Muscle tetany occurs in muscles without absolute refractory period. The stimulus for contraction comes before the preceding contraction/relaxation is over leading to multiple action potentials without a refractory period. It does not occur in cardiac muscle because it has absolute refractory period during which the muscle cannot be excited, thus making tetany impossible
What is occurring when a muscle cell cannot be stimulated during the absolute refractory period?
Repolarization
Can the heart tetanize?
The cardiac muscle fiber absolute refractory is a long period of time (longer then skeletal muscles), so you cannot tetanize cardiac muscle fibers because it has to relax before it is able to contract again.
Why is the cardiac action potential longer?
The reason why cardiac muscle has a longer action potential is to extend the absolute refractory period to prevent another action potential. If too many action potentials stimulate the cardiac muscle it can get into tetanus which keeps the heart continuously contracted without relaxation.
Is the neuron ready to fire during the refractory period?
Refractory period
The very brief moment following stimulation when a muscle remains unresponsive to additional stimulation is called the?
refractory period
2 Define refractory period and differentiate between absolute and relative refractory periods?
refractory period is the interval between action potential , the absolute refractory period is the period in which second action potential can not be initiated but in relative refractory period the second action potential can be initiated by the more strong stimulus.
A period after an initial stimulus when a neuron is not sensitive to another stimulus is the?
After the generation and propagation of an action potential along a neuron, the cell becomes depolarized to the point where there is no potential for further signaling until the cell re-polarizes through the action of ion pumps. This very brief period is called the refractory state.
What effect do calcium slow channels have on shortening or lengthinging the contraction time of the heart muscle?
They cause long refractory period
